Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Deferred Charges and Other Assets:
Total Assets	$ 74,181	$ 70,923
Common Stockholders' Equity:
Total Stockholders' Equity	21,146	20,926
Southern Company [Member]
Current Assets:
Cash and cash equivalents	813	710
Receivables —
Customer accounts receivable	1,312	1,090
Unbilled revenues	579	432
Under recovered regulatory clause revenues	173	136
Other accounts and notes receivable	209	307
Accumulated provision for uncollectible accounts	(17)	(18)
Fossil fuel stock, at average cost	795	930
Materials and supplies, at average cost	1,043	1,039
Vacation pay	177	177
Prepaid expenses	564	665
Deferred income taxes, current	499	506
Other regulatory assets, current	382	346
Other current assets	76	50
Total current assets	6,605	6,370
Property, Plant, and Equipment:
In service	71,462	70,013
Less accumulated provision for depreciation	23,918	24,059
Plant in service, net of depreciation	47,544	45,954
Other utility plant, net	87	211
Nuclear fuel, at amortized cost	889	911
Construction work in progress	8,487	7,792
Total property, plant, and equipment	57,007	54,868
Other Property and Investments:
Nuclear decommissioning trusts, at fair value	1,572	1,546
Leveraged leases	751	743
Miscellaneous property and investments	232	203
Total other property and investments	2,555	2,492
Deferred Charges and Other Assets:
Deferred charges related to income taxes	1,533	1,510
Unamortized debt issuance expense	208	202
Unamortized loss on reacquired debt	234	243
Other regulatory assets, deferred	4,763	4,334
Income taxes receivable, non-current	444	0
Other deferred charges and assets	832	904
Total deferred charges and other assets	8,014	7,193
Total Assets	74,181	70,923
Current Liabilities:
Securities due within one year	3,643	3,333
Interest-bearing refundable deposits	0	275
Notes payable	1,057	803
Accounts payable —
Accounts payable	1,395	1,593
Customer deposits	398	390
Accrued taxes —
Accrued income taxes	12	151
Other accrued taxes	391	487
Accrued interest	241	295
Accrued vacation pay	222	223
Accrued compensation	305	576
Mirror CWIP	353	271
Other current liabilities	677	570
Total current liabilities	8,694	8,967
Long-term Debt:
Total Long-term Debt	22,674	20,841
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	12,187	11,568
Deferred credits related to income taxes	186	192
Accumulated deferred investment tax credits	1,290	1,208
Employee benefit obligations	2,375	2,432
Asset retirement obligations	2,860	2,168
Other cost of removal obligations	1,206	1,215
Other regulatory liabilities, deferred	408	398
Other deferred credits and liabilities	996	594
Total deferred credits and other liabilities	21,508	19,775
Total Liabilities	52,876	49,583
Redeemable Preferred Stock of Subsidiaries	118	375
Redeemable Noncontrolling Interest	41	39
Common Stockholders' Equity:
Common stock	4,555	4,539
Paid-in capital	6,123	5,955
Treasury, at cost	(142)	(26)
Retained earnings (accumulated deficit)	9,767	9,609
Accumulated other comprehensive income (loss)	(121)	(128)
Total common stockholders' equity	20,182	19,949
Preferred and Preference Stock of Subsidiaries	609	756
Noncontrolling Interest	355	221
Total Stockholders' Equity	21,146	20,926
Total Liabilities and Stockholders' Equity	74,181	70,923
Alabama Power [Member]
Current Assets:
Cash and cash equivalents	195	273
Receivables —
Customer accounts receivable	393	345
Unbilled revenues	170	138
Under recovered regulatory clause revenues	28	74
Other accounts and notes receivable	31	23
Affiliated companies	41	37
Accumulated provision for uncollectible accounts	(9)	(9)
Fossil fuel stock, at average cost	249	268
Materials and supplies, at average cost	415	406
Vacation pay	65	65
Prepaid expenses	168	244
Other regulatory assets, current	115	84
Other current assets	10	5
Total current assets	1,871	1,953
Property, Plant, and Equipment:
In service	23,812	23,080
Less accumulated provision for depreciation	8,565	8,522
Plant in service, net of depreciation	15,247	14,558
Nuclear fuel, at amortized cost	338	348
Construction work in progress	1,017	1,006
Total property, plant, and equipment	16,602	15,912
Other Property and Investments:
Equity investments in unconsolidated subsidiaries	68	66
Nuclear decommissioning trusts, at fair value	758	756
Miscellaneous property and investments	88	84
Total other property and investments	914	906
Deferred Charges and Other Assets:
Deferred charges related to income taxes	526	525
Deferred under recovered regulatory clause revenues	97	31
Other regulatory assets, deferred	1,054	1,063
Other deferred charges and assets	156	162
Total deferred charges and other assets	1,833	1,781
Total Assets	21,220	20,552
Current Liabilities:
Securities due within one year	600	454
Accounts payable —
Affiliated accounts payable	244	248
Other accounts payable	267	443
Customer deposits	88	87
Accrued taxes —
Accrued income taxes	3	2
Other accrued taxes	88	37
Accrued interest	75	66
Accrued vacation pay	54	54
Accrued compensation	66	131
Other current liabilities	105	82
Total current liabilities	1,590	1,604
Long-term Debt:
Total Long-term Debt	6,699	6,176
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	3,937	3,874
Deferred credits related to income taxes	71	72
Accumulated deferred investment tax credits	121	125
Employee benefit obligations	308	326
Asset retirement obligations	1,252	829
Other cost of removal obligations	742	744
Other regulatory liabilities, deferred	219	239
Deferred over recovered regulatory clause revenues	72	47
Other deferred credits and liabilities	79	79
Total deferred credits and other liabilities	6,801	6,335
Total Liabilities	15,090	14,115
Redeemable Preferred Stock	85	342
Preference Stock	196	343
Common Stockholders' Equity:
Common stock	1,222	1,222
Paid-in capital	2,324	2,304
Retained earnings (accumulated deficit)	2,331	2,255
Accumulated other comprehensive income (loss)	(28)	(29)
Total common stockholders' equity	5,849	5,752
Total Liabilities and Stockholders' Equity	21,220	20,552
Georgia Power [Member]
Current Assets:
Cash and cash equivalents	24	24
Receivables —
Customer accounts receivable	778	553
Unbilled revenues	294	201
Joint owner accounts receivable	44	121
Other accounts and notes receivable	46	61
Affiliated companies	20	18
Accumulated provision for uncollectible accounts	(6)	(6)
Fossil fuel stock, at average cost	338	439
Materials and supplies, at average cost	425	438
Vacation pay	91	91
Prepaid income taxes	225	278
Other regulatory assets, current	147	136
Other current assets	86	74
Total current assets	2,512	2,428
Property, Plant, and Equipment:
In service	31,363	31,083
Less accumulated provision for depreciation	10,961	11,222
Plant in service, net of depreciation	20,402	19,861
Other utility plant, net	10	211
Nuclear fuel, at amortized cost	551	563
Construction work in progress	4,171	4,031
Total property, plant, and equipment	25,134	24,666
Other Property and Investments:
Equity investments in unconsolidated subsidiaries	61	58
Nuclear decommissioning trusts, at fair value	814	789
Miscellaneous property and investments	37	38
Total other property and investments	912	885
Deferred Charges and Other Assets:
Deferred charges related to income taxes	681	698
Deferred under recovered regulatory clause revenues	0	197
Other regulatory assets, deferred	2,063	1,753
Other deferred charges and assets	446	403
Total deferred charges and other assets	3,190	3,051
Total Assets	31,748	31,030
Current Liabilities:
Securities due within one year	1,660	1,154
Notes payable	200	156
Accounts payable —
Affiliated accounts payable	392	451
Other accounts payable	574	555
Customer deposits	259	253
Accrued taxes —
Other accrued taxes	207	332
Accrued interest	96	96
Accrued vacation pay	62	63
Accrued compensation	81	153
Other current liabilities	309	257
Total current liabilities	3,840	3,470
Long-term Debt:
Total Long-term Debt	8,914	8,683
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	5,524	5,507
Deferred credits related to income taxes	103	106
Accumulated deferred investment tax credits	191	196
Employee benefit obligations	870	903
Asset retirement obligations	1,301	1,223
Other deferred credits and liabilities	286	255
Total deferred credits and other liabilities	8,275	8,190
Total Liabilities	21,029	20,343
Redeemable Preferred Stock	45	45
Preference Stock	221	221
Common Stockholders' Equity:
Common stock	398	398
Paid-in capital	6,232	6,196
Retained earnings (accumulated deficit)	3,830	3,835
Accumulated other comprehensive income (loss)	(7)	(8)
Total common stockholders' equity	10,453	10,421
Total Liabilities and Stockholders' Equity	31,748	31,030
Gulf Power [Member]
Current Assets:
Cash and cash equivalents	44	39
Receivables —
Customer accounts receivable	93	73
Unbilled revenues	77	58
Under recovered regulatory clause revenues	38	57
Other accounts and notes receivable	9	8
Affiliated companies	4	10
Accumulated provision for uncollectible accounts	(2)	(2)
Fossil fuel stock, at average cost	95	101
Materials and supplies, at average cost	55	56
Prepaid expenses	35	40
Other regulatory assets, current	72	74
Other current assets	3	2
Total current assets	523	516
Property, Plant, and Equipment:
In service	4,600	4,495
Less accumulated provision for depreciation	1,234	1,296
Plant in service, net of depreciation	3,366	3,199
Other utility plant, net	77	0
Construction work in progress	387	465
Total property, plant, and equipment	3,830	3,664
Other Property and Investments:
Total other property and investments	15	15
Deferred Charges and Other Assets:
Deferred charges related to income taxes	59	56
Other regulatory assets, deferred	406	416
Other deferred charges and assets	41	41
Total deferred charges and other assets	506	513
Total Assets	4,874	4,708
Current Liabilities:
Notes payable	154	110
Accounts payable —
Affiliated accounts payable	72	87
Other accounts payable	52	56
Customer deposits	36	35
Accrued taxes —
Other accrued taxes	24	9
Accrued interest	10	11
Accrued compensation	13	23
Deferred capacity expense, current	22	22
Liabilities from risk management activities	32	37
Other current liabilities	21	23
Total current liabilities	436	413
Long-term Debt:
Total Long-term Debt	1,370	1,370
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	852	800
Employee benefit obligations	119	121
Other cost of removal obligations	222	235
Other regulatory liabilities, deferred	49	49
Deferred capacity expense	152	163
Other deferred credits and liabilities	187	101
Total deferred credits and other liabilities	1,581	1,469
Total Liabilities	3,387	3,252
Preference Stock	147	147
Common Stockholders' Equity:
Common stock	503	483
Paid-in capital	564	560
Retained earnings (accumulated deficit)	274	267
Accumulated other comprehensive income (loss)	(1)	(1)
Total common stockholders' equity	1,340	1,309
Total Liabilities and Stockholders' Equity	4,874	4,708
Mississippi Power [Member]
Current Assets:
Cash and cash equivalents	212	133
Receivables —
Customer accounts receivable	44	43
Unbilled revenues	37	35
Other accounts and notes receivable	11	11
Affiliated companies	43	51
Accumulated provision for uncollectible accounts	(1)	(1)
Fossil fuel stock, at average cost	95	100
Materials and supplies, at average cost	69	62
Prepaid income taxes	193	191
Other regulatory assets, current	69	73
Other current assets	7	6
Total current assets	779	704
Property, Plant, and Equipment:
In service	4,456	4,378
Less accumulated provision for depreciation	1,194	1,173
Plant in service, net of depreciation	3,262	3,205
Construction work in progress	2,543	2,161
Total property, plant, and equipment	5,805	5,366
Other Property and Investments:
Total other property and investments	6	5
Deferred Charges and Other Assets:
Deferred charges related to income taxes	260	226
Other regulatory assets, deferred	482	385
Income taxes receivable, non-current	544	0
Other deferred charges and assets	71	71
Total deferred charges and other assets	1,357	682
Total Assets	7,947	6,757
Current Liabilities:
Securities due within one year	429	778
Interest-bearing refundable deposits	0	275
Notes payable	505	0
Accounts payable —
Affiliated accounts payable	88	86
Other accounts payable	136	178
Accrued taxes —
Accrued income taxes	0	142
Other accrued taxes	47	84
Accrued interest	13	76
Accrued compensation	14	26
Over recovered regulatory clause liabilities	33	1
Mirror CWIP	353	271
Other current liabilities	59	61
Total current liabilities	1,677	1,978
Long-term Debt:
Long-term debt, affiliated	301	0
Long-term debt, non-affiliated	1,623	1,630
Total Long-term Debt	1,924	1,630
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	844	285
Accumulated deferred investment tax credits	282	283
Employee benefit obligations	146	148
Asset retirement obligations	148	48
Other cost of removal obligations	170	166
Other regulatory liabilities, deferred	65	64
Other deferred credits and liabilities	410	38
Total deferred credits and other liabilities	2,065	1,032
Total Liabilities	5,666	4,640
Redeemable Preferred Stock	33	33
Common Stockholders' Equity:
Common stock	38	38
Paid-in capital	2,692	2,612
Retained earnings (accumulated deficit)	(475)	(559)
Accumulated other comprehensive income (loss)	(7)	(7)
Total common stockholders' equity	2,248	2,084
Total Liabilities and Stockholders' Equity	7,947	6,757
Southern Power [Member]
Current Assets:
Cash and cash equivalents	220	75
Receivables —
Customer accounts receivable	106	77
Other accounts and notes receivable	11	15
Affiliated companies	40	34
Fossil fuel stock, at average cost	17	22
Materials and supplies, at average cost	59	58
Prepaid income taxes	122	19
Deferred income taxes, current	144	306
Other current assets	16	21
Total current assets	735	627
Property, Plant, and Equipment:
In service	6,047	5,657
Less accumulated provision for depreciation	1,125	1,035
Plant in service, net of depreciation	4,922	4,622
Construction work in progress	201	11
Total property, plant, and equipment	5,123	4,633
Other Property and Investments:
Goodwill	2	2
Other intangible assets, net of amortization of $10 and $8 at June 30, 2015 and December 31, 2014, respectively	69	47
Total other property and investments	71	49
Deferred Charges and Other Assets:
Prepaid long-term service agreements	141	124
Other deferred charges and assets -- affiliated	13	5
Other deferred charges and assets	143	112
Total deferred charges and other assets	297	241
Total Assets	6,226	5,550
Current Liabilities:
Securities due within one year	525	525
Notes payable	8	195
Accounts payable —
Affiliated accounts payable	65	78
Other accounts payable	55	30
Accrued taxes —
Accrued income taxes	7	72
Accrued interest	31	30
Other current liabilities	53	17
Total current liabilities	744	947
Long-term Debt:
Total Long-term Debt	1,737	1,095
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	760	863
Accumulated deferred investment tax credits	693	601
Accrued income taxes, non-current	100	0
Deferred capacity revenues -- affiliated	9	15
Other deferred credits and liabilities — affiliated	0	1
Other deferred credits and liabilities	22	18
Total deferred credits and other liabilities	1,584	1,498
Total Liabilities	4,065	3,540
Redeemable Noncontrolling Interest	41	39
Common Stockholders' Equity:
Common stock	0	0
Paid-in capital	1,176	1,176
Retained earnings (accumulated deficit)	587	573
Accumulated other comprehensive income (loss)	4	3
Total common stockholders' equity	1,767	1,752
Noncontrolling Interest, Total	353	219
Total Stockholders' Equity	2,120	1,971
Total Liabilities and Stockholders' Equity	$ 6,226	$ 5,550